Here is a great post from Mark Chinn's Family Law site:
THE POWER OF QUICKEN
Clients are usually told to sit down with their checks and credit cards and average the expenses in different categories over the past 12 months. Usually, clients short cut their work and use educated guesses. However, this is a mistake. The budget of each party is a real key in the negotiation or trial. It plays a key role in alimony and child support. It also plays a key role in determining whether a settlement is adequate.
Budget software is an absolute must when it comes to calculating budgets. The most common and very inexpensive software for this purpose is Quicken. Checks and other expenses can be easily inputted into the program, and detailed and accurate reports generated even by novices in accounting or computers.
I recently attended a mediation where the woman had nearly doubled her actual budget on her financial statement. My client had entered all of his financial information into Quicken for years. Suffice it to say, the Quicken documentation carried the day on the actual budget for negotiation purposes. It saved a lot of negotiation time and probably gave the other side comfort that the numbers we were offering would suffice for her needs.